/Engine/Source/Runtime/Landscape/Classes/LandscapeInfo.h
Moves all Splines to target level. CreatesULandscapeSplinesComponentif needed.
void MoveSplinesToLevel ( [ULandscapeSplinesComponent](API\Runtime\Landscape\ULandscapeSplinesComponent) * InSplineComponent, [ULevel](API\Runtime\Engine\Engine\ULevel) * TargetLevel )